Question

What is the pattern of the veins in the leaves required for the conduction called?
A. Vein distribution
B. Venation
C. Vein morphology
D. Network system

Answer 1

The leaves are the important organs of the plants and main site of photosynthesis. A leaf is the principal lateral appendage of the plant stem. The leaves are known as the foliage. They are specialized for photosynthetic processes and produce simple sugars as food which is then transported to different parts of the plants.

Complete answer: Most plant leaves are flattened and are green in colour due to the presence of chlorophyll. The upper surface of the leaf or the adaxial surface and the lower surface is called abaxial. The two surfaces of leaf differ in colour and palisade mesophyll tissues are present on the upper side of the blade or lamina of the leaf.
The arrangements of veins in a leaf as known venation or venation pattern. It is the way of arrangements of the veins and veins in the lamina of the leaf. The main vein of the leaf is known as midrib and from which several or few smaller veins arise and extend to the end of the lamina. The veins in the leaf are arranged in two important types which are reticulate venation and parallel venation.
The irregular arrangement of veins on a leaf in a network like fashion is known as reticulate venation. This type of arrangement creates a network pattern on the leaf. Plants like hibiscus, mango papaya etc. and other dicot plants. show reticulate venation. In the parallel venation the arrangement of the veins is in parallel fashion and they arise from the midrib of the leaf. In this type of arrangement two or more veins arise from the leaf base and travel parallel to each other and converge at the apex. It is found in the monocots.
Veins support the lamina and transport materials towards and away from the leaf tissue. They radiate through the lamina from the petiole. Different types of venation are characteristics of different types of plants.
Therefore, the correct option is option B

Note:
The leaves show the arrangement of several networks of veins and veinlets over the lamina. The arrangement of the veins are known as venation. It serves as a distinct feature for identification of different types of plants. Veins are responsible for transportation of water and nutrients from the leaves to different parts of the plants.